Forums Faceting Machines Amp draw of faceting machine motor?

• # Amp draw of faceting machine motor?

Posted by on June 25, 2020 at 10:00 am

Does anyone know how much amperage a faceting machine draws? I want to facet in my campervan off my inverter and leisure battery without being plugged in anywhere. My machine is a Graves Mark IV with variable speed motor but having information on any machine with a comparably sized motor would be helpful. I bet some old Quartzite campervan lapidaries should know exactly 🙂

replied 4 years ago 3 Members · 10 Replies
• 10 Replies
• ### willowdalecat

Member
June 25, 2020 at 10:11 am

Sorry, I have a Mark 5XL, not a Mark IV

• ### Bobdrbob

Member
June 25, 2020 at 12:40 pm

Look on your motor and you will see the voltage which will be 120 in the USA then you will see amperage or wattage. if you can give me the info off the motor I can tell you current draw. Email me at sbob219@yahoo.com

• ### Frank1985

Member
June 26, 2020 at 9:14 pm

I have a Mark IV. The plate on the front where the speed control knob is, in the top right hand corner, mine says 50/60 hz, 115 VAC, 1.2 AMP.

So 1.2 amps. That should be maximum amp draw.

• ### Bobdrbob

Member
June 26, 2020 at 10:08 pm

If voltage is 115 and amp draw is 1.2 the amount of watts would be 138.

• ### Bobdrbob

Member
June 26, 2020 at 10:09 pm

Don’t forget the light bulb. Which is maximum of 100 watts I believe.

• ### Frank1985

Member
June 27, 2020 at 8:52 am

If the light is 100 watts then the amp draw will be 0.83 at 120 volt. So amps with light on and motor running will be about 2 amps.

• ### Bobdrbob

Member
June 27, 2020 at 10:06 am

Correct. Watts law states that voltage tines amperage equals wattage. If you make a triangle with one box on top and two on the bottom you can figure out wattage voltage or amperage if you have any of the two. Voltage and amperage go on the bottom. Example. If wattage is 100 and amperage is 1 amp voltage would be 100 divided by 1 equals 100 volts. It is a handy formula for figuring things out when running an inverter or generator. Hope this helps.

• ### Frank1985

Member
June 27, 2020 at 11:09 am

willodaleca
Obviously I misread the original posts as i thought you had a Mark IV like me instead of the Mark 5XL. Sorry about that. The electrical requirements should be on the machine somewhere. Either a plate like mine or on the motor itself. From that you should get either the amps directly or the power which can be converted to amps.
If the motor has a hp rating on it the power draw is hp * 0.746 = Kw (not watts). So a 1/4 hp motor is 0.25*0.746=0.1867 kw (not watts). At 120 volt supply the amps for 1/4 hp motor is 0.1897 kw*1000 = 189.7 watts/120 volts = 1.58 amps.

• ### Bobdrbob

Member
June 27, 2020 at 11:15 am

Yep exactly. Nice to see another numbers guy. Lol. To convert kilowatts to watts just move the decimal point 3 places to the right.

• ### Frank1985

Member
July 9, 2020 at 10:24 pm

Yeah at home when i start in on number stuff my wife just rolls her eyes or gives me the look, Lol.